Hello aspirant, btech is a vast course in itself and it comprises of different branches as well- 

• Computer science
• Information technology
• Electrical engineering
• Electrical and communication
•  Electrical and electronics
• Instrumentation and control
• Fire engineering
• Petrol engineering
• Chemical engineering
• Mining engineering

Computer science , information technology  and electronics and communication is one of the topmost brnaches of engineering if you want to enroll. All th very best